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OvmfPkg/ResetVector: Depend on PCD values of the page tables. 

Currently, the value of the page tables' address is hard-coded in the
ResetVector. This patch replaces these values with a PCD dependency.

A check for the size has been added to alert the developer to rewrite
the ASM according to the new size, if it has been changed.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Marvin Haeuser <Marvin.Haeuser@outlook.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
This commit is contained in:
Marvin Häuser 2016-11-04 13:32:39 +00:00 committed by Laszlo Ersek
parent fdaf78424d
commit 73d66c5871
3 changed files with 24 additions and 11 deletions
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23
OvmfPkg/ResetVector/Ia32/PageTables64.asm
View File

@ -44,10 +44,11 @@ BITS 32
SetCr3ForPageTables64:
;
; For OVMF, build some initial page tables at 0x800000-0x806000.
; For OVMF, build some initial page tables at
; PcdOvmfSecPageTablesBase - (PcdOvmfSecPageTablesBase + 0x6000).
;
; This range should match with PcdOvmfSecPageTablesBase and
; PcdOvmfSecPageTablesSize which are declared in the FDF files.
; This range should match with PcdOvmfSecPageTablesSize which is
; declared in the FDF files.
;
; At the end of PEI, the pages tables will be rebuilt into a
; more permanent location by DxeIpl.
@ -56,21 +57,21 @@ SetCr3ForPageTables64:
mov ecx, 6 * 0x1000 / 4
xor eax, eax
clearPageTablesMemoryLoop:
mov dword[ecx * 4 + 0x800000 - 4], eax
mov dword[ecx * 4 + PT_ADDR (0) - 4], eax
loop clearPageTablesMemoryLoop
;
; Top level Page Directory Pointers (1 * 512GB entry)
;
mov dword[0x800000], 0x801000 + PAGE_PDP_ATTR
mov dword[PT_ADDR (0)], PT_ADDR (0x1000) + PAGE_PDP_ATTR
;
; Next level Page Directory Pointers (4 * 1GB entries => 4GB)
;
mov dword[0x801000], 0x802000 + PAGE_PDP_ATTR
mov dword[0x801008], 0x803000 + PAGE_PDP_ATTR
mov dword[0x801010], 0x804000 + PAGE_PDP_ATTR
mov dword[0x801018], 0x805000 + PAGE_PDP_ATTR
mov dword[PT_ADDR (0x1000)], PT_ADDR (0x2000) + PAGE_PDP_ATTR
mov dword[PT_ADDR (0x1008)], PT_ADDR (0x3000) + PAGE_PDP_ATTR
mov dword[PT_ADDR (0x1010)], PT_ADDR (0x4000) + PAGE_PDP_ATTR
mov dword[PT_ADDR (0x1018)], PT_ADDR (0x5000) + PAGE_PDP_ATTR
;
; Page Table Entries (2048 * 2MB entries => 4GB)
@ -81,13 +82,13 @@ pageTableEntriesLoop:
dec eax
shl eax, 21
add eax, PAGE_2M_PDE_ATTR
mov [ecx * 8 + 0x802000 - 8], eax
mov [ecx * 8 + PT_ADDR (0x2000 - 8)], eax
loop pageTableEntriesLoop
;
; Set CR3 now that the paging structures are available
;
mov eax, 0x800000
mov eax, PT_ADDR (0)
mov cr3, eax
OneTimeCallRet SetCr3ForPageTables64

5
OvmfPkg/ResetVector/ResetVector.inf
View File

@ -29,9 +29,14 @@
ResetVector.nasmb
[Packages]
OvmfPkg/OvmfPkg.dec
MdePkg/MdePkg.dec
UefiCpuPkg/UefiCpuPkg.dec
[BuildOptions]
*_*_IA32_NASMB_FLAGS = -I$(WORKSPACE)/UefiCpuPkg/ResetVector/Vtf0/
*_*_X64_NASMB_FLAGS = -I$(WORKSPACE)/UefiCpuPkg/ResetVector/Vtf0/
[Pcd]
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPageTablesBase
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPageTablesSize

7
OvmfPkg/ResetVector/ResetVector.nasmb
View File

@ -53,6 +53,13 @@
%include "Ia32/SearchForSecEntry.asm"
%ifdef ARCH_X64
#include <AutoGen.h>
%if (FixedPcdGet32 (PcdOvmfSecPageTablesSize) != 0x6000)
%error "This implementation inherently depends on PcdOvmfSecPageTablesSize"
%endif
%define PT_ADDR(Offset) (FixedPcdGet32 (PcdOvmfSecPageTablesBase) + (Offset))
%include "Ia32/Flat32ToFlat64.asm"
%include "Ia32/PageTables64.asm"
%endif